Process for the adjustment of a braking value to a desired braking value

Abstract

A process and system for attaining a desired braking value is disclosed. The actual braking value is adjusted until the desired braking value is attained. Conventionally the braking hysteresis worsens the response of a brake and, thereby, worsens the quality of the regulation of a braking system with regulated braking value. Known processes reduce the brake application energy in steps if the actual braking value is too great until the braking hysteresis has been overcome and the desired braking value has been attained. Whereas, the present invention decreases the brake application energy ZS by a value (HyS+W) consisting of the braking hysteresis HyS associated with the desired braking value and a effect drop-off W. This decrease occurs in the case of excessive actual braking value BI. The process accelerates the attainment of the desired braking value BS. The preferred area of application for the invention are braking systems in the automotive industry.

I claim: 
     
       1. A process for adjusting a braking value B to a desired braking value BS in a braking system having at least one brake (12, 13), wherein said braking value B evolves as functions of brake application energy Z for brake actuation and for brake release, and a difference between said brake actuation function V and said brake release function T is a hysteresis Hy of the braking system for a given braking value B, comprising feeding brake application energy Z to said at least one brake,   producing an actual braking value BI by said braking system as said brake application energy Z is fed to said brake (12, 13), and   decreasing existing brake application energy ZS by a value HyS+W, which comprises hysteresis HyS associated with said desired braking value BS and an effect drop-off W, when the actual braking value BI deviates from the desired braking value BS in the direction of higher braking values B after a rise in said brake application energy Z.   
     
     
       2. The process according to claim 1, further comprising recognizing a deviation BI-BS between said actual braking value BI and said desired braking value BS only when said deviation reaches at least a predetermined limit value L.   
     
     
       3. The process according to claim 1, wherein said effect drop-off W depends at least on the magnitude of said deviation BI-BS. 
     
     
       4. The process according to claim 1, further comprising, if a residual deviation BIE1-BS is present after decreasing said brake application energy, further reducing said brake application energy Z in steps until said desired braking value BS is reached.   
     
     
       5. The process according to claim 1, further comprising, using a new hysteresis HyG in a subsequent braking process in which a deviation BI-BS occurs, if a residual deviation BIE1-BS is still present during brake actuation in the braking process after the reduction of the existing brake application energy ZS.   
     
     
       6. The process of claim 5, wherein said new hysteresis HyG comprises an increase by a correction value G of the hysteresis HyS associated with the desired braking value BS. 
     
     
       7. The process according to claim 6, further comprising if a residual deviation BIE1-BS is still present in a subsequent braking process after the reduction of the existing brake application energy ZS by using the new hysteresis HyG, repeating utilization of correction value G in at least one further braking process in which a deviation BI-BS occurs until reduction through said using of said new hysteresis HyG results in the desired braking value BS.   
     
     
       8. The process according to claim 1, further comprising if a new deviation BS-BIE2 of another actual braking value BIE2 from the desired braking value BS in direction of lower braking values B is present during brake actuation in a braking process after reduction of the existing brake application energy ZS, using a new hysteresis HyV in a subsequent braking process in which a deviation BI-BS occurs, wherein said new hysteresis HyV comprises a reduction of the hysteresis HyS associated with said desired braking value BS by a correction value V.   
     
     
       9. The process according to claim 8, wherein said actual braking value BIE2 is obtained by reducing the existing brake application energy ZS by the value HyS+W. 
     
     
       10. The process according to claim 8, further comprising if during said subsequent braking process the actual braking value BIE2 deviates from the desired braking value BS in the direction of lower braking values B after the reduction of the existing brake application energy ZS with the utilization of the new hysteresis HyV, repeating said utilization of the correction value V in at least one further braking process in which a deviation BI-BS occurs until the desired braking value BS is obtained through utilization of the new hysteresis HyV.   
     
     
       11. A braking system for adjusting an actual braking value B to a desired braking value BS, comprising at least one brake (12, 13),   a braking value indicator (2) for emitting an electrical desired-braking value signal,   a braking value sensor (1) for emitting an electrical actual braking value signal,   an electrically controlled energy distributor (11) having a control system (14) and an output connected to said brake (12, 13), and   regulating electronics (4) having a first input connected to said braking value indicator (2) and a second input connected to said braking value sensor (1) and an output connected to said control system (14) of the energy distributor (11), wherein said regulating electronics   compare the actual braking value signal to the desired braking value signal to determine a brake application energy signal,   transmit said brake application energy signal to the control system (14) of the energy distributor (11),   store a hysteresis Hy as a function of the braking value B, and   reduce said brake application energy signal by a value resulting in reduction of existing brake application energy ZS by a value HyS+W, which value comprises hysteresis HyS associated with the desired braking value BS and an effect drop-off W, when a deviation of the actual braking value BI from the desired braking value BS in direction of higher braking values B is detected following a rise in the brake application energy signal.   
     
     
       12. The braking system as in claim 11, wherein said regulating electronics (4) further reduces the brake application energy signal in a subsequent braking process, in which a deviation BI-BS occurs, by a value corresponding to the application of a hysteresis HyG increased by a correction value G, if a residual deviation BIE1-BS still exists during a brake actuation in a braking process after the reduction of the brake application energy signal, and   repeats the reduction in subsequent braking processes which follow a braking process in which a residual deviation has appeared until the desired braking value BS is attained.   
     
     
       13. The braking system as in claim 11, wherein said regulating electronics (4) further reduces the brake application energy signal by a value corresponding to the application of a hysteresis HyV reduced by a correction value V in subsequent braking process in which a deviation BI-BS occurs when a deviation BS-BIE2 of the actual braking value BIE2 from the desired braking value BS in direction of lower braking value B is present during a brake actuation in a braking process after the reduction of the brake application energy signal, and   repeats said reduction in subsequent braking processes following a braking process in which such a deviation BE-BIE2 has occurred until the desired braking value BS is obtained.